No-one that has an exploit is going to waste it on 3.60. Maybe once they add some real features for EVERYONE, and maybe once higher firmware is actually required for a lot of new games, and you can't just patch it out.
And again, none of the developers are going to waste an exploit when it's very easy to get an exploitable console. Anyone on 3.56 already should give up and acquire a 3.55 while you still can.
STOP! Before you ask questions... READ the first post! RTFFP = Read The F*cking First Post
Yes, A 3.55 "jb" (cfw) is available, no >3.55 "jb" or cfw yet.
Yes, A 3.55 downgrade is available. But not to lower than stock firmware! (What it came with)
No >3.55 downgrade is out there yet.